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>For other uses, see Rainbow (disambiguation). A rainbow is an optical and meteorological phenomenon that causes a nearly continuous spectrum of light to appear in the sky when the sun shines onto falling rain. It is a multicoloured arc with red on the outside and violet on the inside. The full sequence of colours is most commonly cited as red, orange, yellow, green, blue, indigo, and violet, though it is important to note that this is an inconsistent list; all primary and secondary colours are present in some form, but only one tertiary. It is commonly thought that indigo was included due to the different religious connotations of the numbers six and seven at the time of Isaac Newton's work on light, despite its lack of scientific significance and the poor ability of humans to distinguish colours in the blue portion of the visual spectrum.
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Ink wiki:

>Ink (or Inkwell) is also a handwriting recognition technology built into Apple Computer's Mac OS X since Mac OS X v10.2. Ink can refer to a TV series starring Ted Danson. An ink is a liquid containing various pigments and/or dyes used for colouring a surface to render an image or text. Common perceptions consider ink for use in drawing or writing with a pen or brush.
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